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T. W. JOHN-SON. Concentrating Extracts.

No. 81,643. Patented Sept. 1,1868.

THOMAS WIJOHNSON, OF NEW YORK. N. Y.

Letters Patent No. 81,643, dated September 1, 1868 IMPROVED APPARATUS FOR GONGENTRATING EXTRAGTS.

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TO ALL WHOM IT MAY CONCERN:

' Be it known thatI, Tnonss W. JOHNSON, of New York, in the county and State of New York, have invented a new andimproved Apparatus for Concentrating Extracts; and I do hereby declare the following to he a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, refer ence being had to the accompanying drawing, forming part of thisspecification, in which drawing- Figure 1 represents a longitudinal section of this invention.

Figure 2 is a transverse section thereof.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of an air-tight receiver, provided with a convex or semicylindrical top, which terminates in a gutter, and with a concave false bottom, which forms the top of a heatingchamber, in combination with an agitator extending throughout the entire length .of the receiver, and with a cold-water -jet over the convex top, in such a manner that when the temperature of the extract to be concentrated in the receiver is raised to about 170. or 180?, the agitator will cause the vapors to rise, and the vapors, on coming in contact with the inner surface of the top, (which is cooled by the jet of cold water thrown on it,') will condense, therebyforming a partial vacuum, which materially facilitates the evaporation. I

The water resulting from the condensation of the vapors is collected in the gutter, from which it is carried off by a pipe terminating in a tank partially filled with water, so that the access of air to the interior of the receiver is'prevented, and that an apparatus is obtained in which the extract of tan-bark or other similar liquid can be concentrated with comparatively little expenditure of fuel, and at a temperature below the boiling-point of water, whereby all danger of scorching the extract is avoided.

A represents a receiver, which is made of sheet metal or any other suitable materlal. This receiver is provided with a convex or semi-cylindrical top, B, which terminates over the gutter C, so that the water resulting from the condensation ofthe vapors which come in contact with the inner surface of the top will collect in the gutter, from which it discharges through a pipe, a, which terminates in a tank, 6, partially filled with water, so that no air can enter into the receiver through said pipe. 7

The receiver A is provided with a concave false bottom, D, which forms the top of the. heating-chamber E, which communicates by a pipe, 0, with a generator of steam or hot air, so that the temperature of the liquid extract to be concentrated in the receiver can be raised to any desired degree.

Through the receiver A, and close to the concave false bottom, extends an agitator, F, to which a revolving motion isimparted by a belt and pulley, or by any other suitable 'means;

: The receiver is filled with the liquid extract to be concentrated, and the liquid ishcated' to 170 or 180, while the agitator is kept in continuousmotion; By the action of the agitator the extract is kept uniformlymixed, and prevented fromfcrminga sediment on the bottom of the receiver; and furthermore, the vapors are disengaged from the liquid, and caused to rise so' as to strike the top, B.

Over thistop is secured a pipe, d, terminating in a rose, 0, so that a jet of cold water can be thrown on said top, whereby the same is kept cool, and in the proper condition to condense the vapors which come in contact with its inner surface. y

' By the condensation of the vapors a partial vacuum is formed'in the interior of the receiver A, and thereby the evaporation of the liquid is materially facilitated. The water resulting from the condensation of the vapors collects in gutter C, and is drawn off by the pipe a, as above statedi V By these means an apparatus is obtained in which the operation of concentrating extracts of tan-bark or other liquids of a similar nature can be eliected at a low temperature, thereby preventing all danger of scorching the extract, and effecting the operation in the'most economical manner. 7

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The receiver. A, provided withra convex top, 13, gutter G, and cold-water pipe 01, in combination with the agitator F and heating-chamber E, substantially as and for the purpose set forth.

THOS. W. JOHNSON. Witnesses:

W. HAUFF,

E. F. 'KAsrnsnuesn. 

